Question

Chromosomal mechanism of sex determination in human beings is called ______.

• A. Heterogamesis
• B. Haemopoiesis
• C. Transgenesis
• D. Parthenogenesis

Hint:

In humans: Male (XY) = heterogametic, Female (XX) = homogametic.

Answer 1

The Correct Option is A

Step 1: Understanding sex determination in humans.
In human beings, sex determination is based on the type of sex chromosomes contributed by the male parent. Females are homogametic (XX), whereas males are heterogametic (XY).
Step 2: Meaning of heterogamesis.
Heterogamesis refers to the production of two different types of gametes with respect to sex chromosomes. In human males, sperms are of two types: X-bearing and Y-bearing.
Step 3: Analysis of options.
(A) Heterogamesis: Correct, as males produce two types of gametes (X and Y).
(B) Haemopoiesis: Formation of blood cells, unrelated to sex determination.
(C) Transgenesis: Introduction of foreign genes into an organism.
(D) Parthenogenesis: Development of an organism from an unfertilized egg.
Step 4: Conclusion.
The chromosomal mechanism of sex determination in humans is heterogamesis.